How to specify the number of nodes I want without automatic optimization

[Dong Mo]

Hi all,

I am having a problem that system is doing automatic optimization based on my NS file

For example I have this setup

set ns [new Simulator]

source tb_compat.tcl

set sender1 [$ns node]

tb-set-hardware $sender1 d710

set sender2 [$ns node]

tb-set-hardware $sender2 d710

set receiver [$ns node]

tb-set-hardware $receiver d710

set lan0 [$ns make-lan "$sender1 $sender2 $receiver" 100Mb 10ms]

$ns rtproto Static

$ns run

What I wanted is to have three delay nodes but the system only gives me 2.

Even if I explicitly ask emulab to give me three delay nodes by using:

set ns [new Simulator]

source tb_compat.tcl

set bridge0 [$ns bridge]

set bridge2 [$ns bridge]

set bridge1 [$ns bridge]

tb-set-hardware $bridge0 d710

tb-set-hardware $bridge1 d710

tb-set-hardware $bridge2 d710

set sender1 [$ns node]

tb-set-hardware $sender1 d710

set sender2 [$ns node]

tb-set-hardware $sender2 d710

set receiver [$ns node]

tb-set-hardware $receiver d710

set link0 [$ns duplex-link $sender1 $bridge0 100M 10ms DropTail]

set link1 [$ns duplex-link $sender2 $bridge1 100M 10ms DropTail]

set link2 [$ns duplex-link $receiver $bridge2 100M 10ms DropTail]

set lan0 [$ns make-lan "$bridge0 $bridge1 $bridge2" 100Mb 0ms]

$ns rtproto Static

$ns run

What I can get is still 2 delay nodes

Is there any way to turn off this feature?

Thanks

-Mo

[Mike Hibler]

You should be able to put:

tb-set-delay-capacity 1

in your NS file. But *please* only do this if you are having a problem with
the default, as it will (obviously) use twice as many machines and reduce
the chances that your topology will swap in.

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